Hervé Bazin in his 1966 essay Plumons l’Oiseau ("Let's pluck the bird"), used the Greek letter psi with a dot below for the same purpose.[8] In the same work, the author proposed five other innovative punctuation marks: the "doubt point" (Point de doute.svg), "certitude point" (Point de certitude.svg), "acclamation point" (Point d'acclamation.svg), "authority point" (Point d'autorité.svg), and "love point" (Point d'amour.svg).[9]